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Recovery and reutilization method of cyclohexylamine in CBS production technology

A production process, the technology of cyclohexylamine, applied in the purification/separation of amino compounds, organic chemistry, etc., can solve the problems of waste of cyclohexylamine raw materials, increase production costs, increase the amount of cyclohexylamine, etc., to reduce raw material costs, The effect of increasing the utilization rate and increasing the profit margin of the enterprise

Inactive Publication Date: 2015-03-11
TIANJIN YIHUA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the oxidation process, in order to improve the purity of the crude product, the amount of cyclohexylamine is often increased, so that the generated impurities are dissolved in cyclohexylamine and removed by filtration. Although such a process improves the quality of the product, it cannot be used in large-scale production. Cause the waste of cyclohexylamine raw material in the process, also improved production cost simultaneously

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] For MBT with a content of 75%, add recovered cyclohexylamine aqueous solution (2620L, cyclohexylamine content 44%), add water 580Kg, new cyclohexylamine 1275L, water 1975L, beat at 40°C for 30-40min, add 10% H 2 o 2 1230-1250L, stir at 40-45°C for 80-100min, keep warm for 30min, then add 670LNaClO, stir at 44-46°C for 50-70min, cool down to 30°C, keep for 30min, then filter, wash and dehydrate to obtain wet product and recover cyclohexylamine-containing mother liquor. After the wet product is dried, the purity of the product is 95-97%, which meets the quality standard.

Embodiment 2

[0020] MBT with a content of 75%, add recycled cyclohexylamine aqueous solution (3200L, cyclohexylamine content 36%), add water 0Kg, new cyclohexylamine 1275L, water 1975L, beat at 40°C for 30-40min, add 10% H 2 o 2 1230-1250L, stir at 40-45°C for 80-100min, keep warm for 30min, then add 670LNaClO, stir at 44-46°C for 50-70min, cool down to 30°C, keep for 30min, then filter, wash and dehydrate to obtain wet product and recover cyclohexylamine-containing mother liquor. After the wet product is dried, the purity of the product is 95-97%, which meets the quality standard.

Embodiment 3

[0022] For MBT with a content of 75%, add recovered cyclohexylamine aqueous solution (3800L, cyclohexylamine content 30%), reduce water 620Kg, new cyclohexylamine 1275L, water 1975L, beat at 40°C for 30-40min, add 10% H 2 o 2 1230-1250L, stir at 40-45°C for 80-100min, keep warm for 30min, then add 670LNaClO, stir at 44-46°C for 50-70min, cool down to 30°C, keep for 30min, then filter, wash and dehydrate to obtain wet product and recover cyclohexylamine-containing mother liquor. After the wet product is dried, the purity of the product is 95-97%, which meets the quality standard.

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Abstract

The invention provides a recovery and reutilization method of cyclohexylamine in a CBS production technology. The method comprises the following steps: A)synthesis of a rubber promoter CBS; B)adding a CBS crude product obtained in the step A) in a centrifuge spin dryer for performing solid-liquid separation; C)distilling a mother liquor obtained in the step B) to obtain a cyclohexylamine aqueous solution with a certain content; D)determining the proportion of the recovered cyclohexylamine so as to determinate the cyclohexylamine content; and E)adding the cyclohexylamine aqueous solution with the certain content in proportion in an oxidation kettle for next reaction. The method has the beneficial effect that cyclohexylamine in the mother liquor can be recovered through a distillation mode, the recovered cyclohexylamine is placed in the oxidation kettle for continuous reaction, and the product purity and quality can not be influenced. The method is capable of increasing the raw material utilization rate, reducing the product raw material cost and increasing the enterprise profit margin.

Description

technical field [0001] The invention relates to a method for recycling cyclohexylamine, in particular to a method for recycling cyclohexylamine in the production process of rubber accelerator CBS. Background technique [0002] At present, the rubber accelerator CBS is one of the commonly used aftereffect accelerators, which has two advantages of excellent scorch resistance and short vulcanization time. When used together with accelerators MBT, TMTD and MBTS, it can improve the modulus and tensile strength of vulcanized rubber. The accelerator is especially suitable for natural rubber and synthetic rubber reinforced with carbon black by the oil furnace method with strong alkalinity, and has slight discoloration, no blooming, and excellent aging resistance of the vulcanized rubber. It is mainly suitable for the manufacture of tires, rubber shoes, rubber hoses, Tapes, cables and other industrial products. The existing CBS production process is based on accelerators MBT, cyclo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D277/80C07C209/86C07C211/35
CPCC07D277/80C07C209/86C07C2601/14
Inventor 张维仁岳姝雅高强盛晨军
Owner TIANJIN YIHUA CHEM
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